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Investments (Tables)
 12 Months Ended
Jun. 24, 2018
Investments, Debt and Equity Securities [Abstract]  
Summary of Short-term Investments by Type
The following table summarizes short-term investments (in thousands): 
 
June 25, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Municipal bonds

$177,890

 

$2,219

 

($68
)
 

$180,041

Corporate bonds
175,991

 
1,925

 
(195
)
 
177,721

U.S. agency securities
—

 
—

 
—

 
—

Non-U.S. certificates of deposit
120,379

 
—

 
—

 
120,379

U.S. certificates of deposit
—

 
—

 
—

 
—

Commercial paper
200

 
—

 
—

 
200

Total short-term investments

$474,460

 

$4,144

 

($263
)
 

$478,341

The following table summarizes short-term investments (in thousands):
 
June 24, 2018
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair Value
Municipal bonds

$110,198

 

$17

 

($939
)
 

$109,276

Corporate bonds
77,871

 
36

 
(1,150
)
 
76,757

U.S. agency securities
3,922

 
—

 
(38
)
 
3,884

Non-U.S. certificates of deposit
77,744

 
—

 
—

 
77,744

U.S. certificates of deposit
500

 
—

 
—

 
500

Commercial paper
—

 
—

 
—

 
—

Total short-term investments

$270,235

 

$53

 

($2,127
)
 

$268,161
Summary of Gross Unrealized Losses and Fair Value of Short-term Investments by Type and Length of Time
The following table presents the gross unrealized losses and estimated fair value of the Company’s short-term investments, aggregated by investment type and the length of time that individual securities have been in a continuous unrealized loss position (in thousands, except numbers of securities):
 
June 25, 2017
 
Less than 12 Months
 
Greater than 12 Months
 
Total
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Municipal bonds

$26,816

 

($68
)
 

$—

 

$—

 

$26,816

 

($68
)
Corporate bonds
57,404

 
(195
)
 
—

 
—

 
57,404

 
(195
)
U.S. agency securities
—

 
—

 
—

 
—

 
—

 
—

Total

$84,220

 

($263
)
 

$—

 

$—

 

$84,220

 

($263
)
Number of securities with an unrealized loss
 
 
67

 
 
 
—

 
 
 
67

The following table presents the gross unrealized losses and estimated fair value of the Company’s short-term investments, aggregated by investment type and the length of time that individual securities have been in a continuous unrealized loss position (in thousands, except numbers of securities): 
 
June 24, 2018
 
Less than 12 Months
 
Greater than 12 Months
 
Total
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
 
Fair Value
 
Unrealized
Loss
Municipal bonds

$97,470

 

($861
)
 

$3,642

 

($78
)
 

$101,112

 

($939
)
Corporate bonds
61,453

 
(1,088
)
 
1,486

 
(62
)
 
62,939

 
(1,150
)
U.S. agency securities
3,884

 
(38
)
 
—

 
—

 
3,884

 
(38
)
Total

$162,807

 

($1,987
)
 

$5,128

 

($140
)
 

$167,935

 

($2,127
)
Number of securities with an unrealized loss
 
 
151

 
 
 
6

 
 
 
157
Contractual Maturities of Short-term Investments by Type
The contractual maturities of short-term investments at June 24, 2018 were as follows (in thousands): 
 
Within One
Year
 
After One,
Within Five
Years
 
After Five,
Within Ten
Years
 
After Ten
Years
 
Total
Municipal bonds

$24,700

 

$84,576

 

$—

 

$—

 

$109,276

Corporate bonds
22,534

 
54,223

 
—

 
—

 
76,757

U.S. agency securities
—

 
3,884

 
—

 
—

 
3,884

Non-U.S. certificates of deposit
77,744

 
—

 
—

 
—

 
77,744

U.S. certificates of deposit
500

 
—

 
—

 
—

 
500

Total short-term investments

$125,478

 

$142,683

 

$—

 

$—

 

$268,161